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Li, Jin Feng,Rupa, Esrat Jahan,Hurh, Joon,Huo, Yue,Chen, Ling,Han, Yaxi,Ahn, Jong chan,Park, Jin Kyu,Lee, Hyun A.,Mathiyalagan, Ramya,Yang, Deok-Chun Elsevier 2019 Optik Vol.183 No.-
<P><B>Abstract</B></P> <P>Zinc Oxide nanoparticles were synthesized via co precipitation methods from <I>Cordyceps militaris</I> fungus. In this method zinc nitrate hex- hydrate were used as a precursor. The Synthesized nanoparticles were characterized through different analytical method for identification of morphology, size, crystallinity and also purity. The nanoparticles gave highest peak at 350 in Uv–vis spectroscopy which confirmed the formation of <I>Cordyceps</I> zinc oxide nanoparticles. The Field emission transmission electron microscopy (FE-TEM) analyzed the morphology, purity and elemental distribution of the nanoparticles. The X-ray powder diffraction (XRD) study explored the size is about 10.15 nm. Finally, the functional group of plant and nanoparticles were identified using FT-IR analyzer. The <I>Cordyceps militaris</I> zinc oxide nanoparticles have ability to degrade hazardous dye Methylene blue about 97% in the presence of Uv-radiation. So this study emphasizes that the <I>Cordyceps militaris</I> zinc oxide nanoparticles can be the best photo catalyst for the safety of our environment from dangerous water pollution.</P>
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Performance of Contra-Rotating Propellers for Stratospheric Airships
Tang, Zhihao,Liu, Peiqing,Sun, Jingwei,Chen, Yaxi,Guo, Hao,Li, Guangchao The Korean Society for Aeronautical and Space Scie 2015 International Journal of Aeronautical and Space Sc Vol.16 No.4
Small advance ratio and low Reynolds number of stratospheric propulsion system bring lots of challenges to the design of propellers. Contra-rotating propeller configuration is proposed to improve the propulsion efficiency. In this paper, the feasibility of contra-rotating propeller for stratospheric airship has been assessed and its performance has been investigated by wind tunnel tests. The experimental results indicate, at relatively low Reynolds number, although the advance ratio is fixed, the performance of propellers is different with variation of Reynolds number. Moreover, at the same Reynolds number, the efficiency of contra-rotating propeller achieved appears to be a few percent greater than that for a standard conventional propulsion system. It can be concluded that contra-rotating propellers would be an efficient means to improve the performance of stratospheric airship propulsion system.
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Performance of Contra-Rotating Propellers for Stratospheric Airships
Zhihao Tang,Peiqing Liu,Jingwei Sun,Yaxi Chen,Hao Guo,Guangchao Li 한국항공우주학회 2015 International Journal of Aeronautical and Space Sc Vol.16 No.4
Small advance ratio and low Reynolds number of stratospheric propulsion system bring lots of challenges to the design of propellers. Contra-rotating propeller configuration is proposed to improve the propulsion efficiency. In this paper, the feasibility of contra-rotating propeller for stratospheric airship has been assessed and its performance has been investigated by wind tunnel tests. The experimental results indicate, at relatively low Reynolds number, although the advance ratio is fixed, the performance of propellers is different with variation of Reynolds number. Moreover, at the same Reynolds number, the efficiency of contra-rotating propeller achieved appears to be a few percent greater than that for a standard conventional propulsion system. It can be concluded that contra-rotating propellers would be an efficient means to improve the performance of stratospheric airship propulsion system.
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Ke Zhang,Chenxi Wang,Lei Gou,Yaxi Li,Cui Li,Guoshuai Luo,Xiangyang Zhang 대한신경정신의학회 2024 PSYCHIATRY INVESTIGATION Vol.21 No.4
Objective Studies on duration of untreated psychosis are common in patients with schizophrenia, but few studies have investigated the relationship between duration of untreated illness (DUI) and suicide, especially in patients with chronic schizophrenia. Therefore, we intended to investigate the relationship between DUI and suicide and clinical correlates in patients with chronic schizophrenia.Methods A total of 1,555 Chinese patients with chronic schizophrenia were enrolled in this study. DUI was measured in years, reflecting the prolonged untreated periods observed in this population. Clinical correlates were assessed, including symptoms, cognitive functioning, and body mass index. Suicidal ideation and attempts were also examined. Statistical analyses, including multivariate models, were employed to investigate the associations between DUI and clinical correlates while controlling for potential confounders.Results The study revealed a significant proportion (23.3%) of patients with chronic schizophrenia in China received their first treatment after a 4-year delay, with the longest untreated duration reaching 39 years. Patients with longer DUI exhibited more severe negative symptoms, lower immediate memory scores, a higher likelihood of being overweight, and surprisingly, a reduced likelihood of suicidal ideation and attempts. Each additional year of untreated illness was associated with a 3% decrease in the risk of suicidal ideation and attempts.Conclusion The findings underscore the prevalence of extended untreated periods in Chinese patients with chronic schizophrenia and highlight the impact of DUI on negative symptoms, cognitive function, and body weight. Intriguingly, a longer DUI was associated with a lower risk of suicidal ideation and attempts.
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